Procedure for collecting gastric contents in giant Amazon turtles Podocnemis expansa (Schweigger, 1812) (Testudines, Podocnemididae). - Alves Junior, Jose R. F.; de Sousa, Eliane; Lustosa, Ana P. G.; Magajevski, Fernanda S.; Girio, Raul J. S.; Werther, Karin (My University, 2011)